Adjusting mechanism and projector

ABSTRACT

An adjusting mechanism for adjusting a position of a display panel includes a first plate including a placing portion on which the display panel is placed, a second plate on which the first plate is placed, the second plate disposed on the opposite side of a display panel side with respect to the first plate, a third plate on which the second plate is placed, the third plate disposed on an opposite side of a first plate side with respect to the second plate, a first position adjusting actuator configured to move the first plate in a direction along a Z axis, a θx direction, and a θy direction, a second position adjusting actuator configured to move the second plate in a direction along an X axis and a θz direction, and a third position adjusting actuator configured to move the third plate in a direction along the Y axis.

The present application is based on, and claims priority from JPApplication Serial Numbers 2019-031328, 2019-031329, and 2019-031330,all filed Feb. 25, 2019, the disclosure of all of which is herebyincorporated by reference herein in its entirety.

BACKGROUND 1. Technical Field

The present disclosure relates to an adjusting mechanism and aprojector.

2. Related Art

There has been known a method of adjusting the position of a liquidcrystal panel in an optical system of a projector. For example, JPA-2003-98599 (Patent Literature 1) proposes a focus adjusting method fora liquid crystal projector.

However, in the focus adjusting method described in Patent Literature 1,although an algorithm of focus adjustment is disclosed, a specificadjusting mechanism is not disclosed. That is, there has been a demandfor an adjusting mechanism for adjusting the position of a display panelsuch as a liquid crystal panel.

SUMMARY

An adjusting mechanism according to an aspect of this application is anadjusting mechanism for adjusting a position of a display panel, theadjusting mechanism including: a first plate including a placing portionon which the display panel is placed; a second plate on which the firstplate is placed, the second plate being disposed on an opposite side ofa display panel side with respect to the first plate; a third plate onwhich the second plate is placed, the third plate being disposed on anopposite side of a first plate side with respect to the second plate; afirst position adjusting actuator; a second position adjusting actuator;and a third position adjusting actuator. In a state in which the displaypanel is placed on the placing portion, a surface parallel to a displaysurface of the display panel is a reference plane, a coordinate axisorthogonal to the reference plane is a Z axis, two coordinate axesorthogonal to each other in the reference plane are an X axis and a Yaxis, a rotating direction around the X axis is a θx direction, arotating direction around the Y axis is a θy direction, and a rotatingdirection around the Z axis is a θz direction, the first positionadjusting actuator is configured to move the first plate in a directionalong the Z axis, the θx direction, and the θy direction, the secondposition adjusting actuator is configured to move the second plate in adirection along the X axis and the θz direction, and the third positionadjusting actuator is configured to move the third plate in a directionalong the Y axis.

In the adjusting mechanism, the first position adjusting actuator mayinclude a first actuator, a second actuator, and a third actuator, thefirst actuator may include a first linearly mover configured to linearlymove in the direction along the Z axis, the second actuator may includea second linearly mover configured to linearly move in the directionalong the Z axis, the third actuator may include a third linearly moverconfigured to linearly move in the direction along the Z axis, the firstactuator may be disposed on one side with respect to the placingportion, and the second actuator and the third actuator may be disposedon another side opposite to a first actuator side with respect to theplacing portion.

In the adjusting mechanism, the first linearly mover, the secondlinearly mover, and the third linearly mover may come into contact withthe first plate from the direction along the Z direction.

In the adjusting mechanism, the first actuator, the second actuator, andthe third actuator may be disposed to be opposed to one another in thedirection along the Y axis across the placing portion, and the firstplate may move in the direction along the Z direction when the firstlinearly mover, the second linearly mover, and the third linearly moverare linearly moved in a same direction along the Z axis.

In the adjusting mechanism, the first plate may move in the θx directionwhen the second linearly mover and the third linearly mover arerelatively linearly moved in a same direction along the Z axis withrespect to the first linearly mover.

In the adjusting mechanism, the first plate may move in the θy directionwhen the second linearly mover is relatively linearly moved along afirst direction along the Z direction with respect to the first linearlymover and the third linearly mover is relatively linearly moved along asecond direction opposite to the first direction along the Z axis withrespect to the first linearly mover.

In the adjusting mechanism, the adjusting mechanism may further includea first elastic member coupling the second plate and the third plate,and the first elastic member may be elastically deformable in thedirection along the X axis.

In the adjusting mechanism, the adjusting mechanism may further include:abase on which the third plate is placed, the base being disposed on anopposite side of a second plate side with respect to the third plate;and a second elastic member and a third elastic member which areprovided to be opposed to each other in the direction along the Y axis,the second elastic member and the third elastic member being couplingthe third plate and the base, and configured to restrict movement of thethird plate in the direction along the Y axis with respect to the base.

In the adjusting mechanism, the second position adjusting actuator mayinclude a first actuator and a second actuator, the first actuator mayinclude a first linearly mover configured to linearly move in thedirection along the X axis, the second actuator may include a secondlinearly mover configured to linearly move in the direction along the Xaxis, and the first linearly mover and the second linearly mover maycome into contact with the second plate.

In the adjusting mechanism, the first linearly mover and the secondlinearly mover may project in the direction along the X axis to pressthe second plate.

In the adjusting mechanism, the second plate may move in the directionalong the X axis when a projection amount of the first linearly mover inthe direction along the X axis and a projection amount of the secondlinearly mover in the direction along the X axis are substantiallyequal.

In the adjusting mechanism, the second plate may move in the θzdirection when a projection amount of the first linearly mover in thedirection along the X axis and a projection amount of the secondlinearly mover in the direction along the X axis are different.

In the adjusting mechanism, the first elastic member may be applied witha preload in the direction along the X axis.

In the adjusting mechanism, the third plate may include a pair ofcontact portions provided at both ends in the direction along the Yaxis, the first elastic member may be a leaf spring, the first elasticmember may be coupled to the third plate via the pair of contactportions and coupled to the second plate in a position of the firstelastic member between the pair of contact portions in the directionalong the Y axis, and the first actuator and the second actuator may bedisposed to be opposed to the pair of contact portions and the firstelastic member in the direction along the X axis.

A projector according to an aspect of this application includes: a lightsource; a display panel configured to modulate light emitted from thelight source; a projection lens configured to project the lightmodulated by the display panel; and the adjusting mechanism on which thedisplay panel is placed.

In the projector, a focus of the projection lens with respect to thedisplay panel may be adjusted when the first plate moves in at least onedirection among the direction along the Z axis, the θx direction, andthe θy direction and changes a position of the display panel withrespect to the projection lens.

In the projector, the projector may further include a display panel forgreen configured to modulate green light as the display panel, a displaypanel for red configured to modulate red light as the display panel, adisplay panel for blue configured to modulate blue light as the displaypanel, an adjusting mechanism for red configured to adjust a position ofthe display panel for red as the adjusting mechanism, and an adjustingmechanism for blue configured to adjust a position of the display panelfor blue as the adjusting mechanism. A position of the display panel forred and a position of the display panel for blue with respect to thedisplay panel for green are determined by changing the position of thedisplay panel for red according to movement of the second plate and thethird plate in the adjusting mechanism for red and changing the positionof the display panel for blue according to movement of the second plateand the third plate in the adjusting mechanism for blue.

In the projector, the projector may further include a color combinationoptical system configured to combine lights respectively emitted fromthe display panel for red, the display panel for green, and the displaypanel for blue, and, among the first plate, the second plate, and thethird plate, the third plate out of the three plates may be located on anearest side to the color combination optical system and the first plateout of the three plates may be located on a farthest side from the colorcombination optical system.

An adjusting mechanism according to an aspect of this application is anadjusting mechanism for adjusting a position of a display panel, theadjusting mechanism including: a plate including a placing portion onwhich the display panel is placed; a first actuator configured to comeinto contact with the plate and move the plate; a second actuatorconfigured to come into contact with the plate and move the plate; and athird actuator configured to come into contact with the plate and movethe plate. The first actuator includes a first linearly mover configuredto linearly move in a predetermined direction, the second actuatorincludes a second linearly mover configured to linearly move in thepredetermined direction, the third actuator includes a third linearlymover configured to linearly move in the predetermined direction, thefirst actuator is disposed on one side with respect to the placingportion, and the second actuator and the third actuator are disposed onanother side opposite to the first actuator side with respect to theplacing portion.

An adjusting mechanism according to an aspect of this application is anadjusting mechanism for adjusting a position of a display panel, theadjusting mechanism including: a first plate including a placing portionon which the display panel is placed; a second plate on which the firstplate is placed, the second plate being disposed on an opposite side ofthe display panel side with respect to the first plate; a third plate onwhich the second plate is placed, the third plate being disposed on anopposite side of a first plate side with respect to the second plate; afirst position adjusting actuator; a second position adjusting actuator;and a first elastic member coupling the second plate and the thirdplate. In a display surface of the display panel, two coordinate axesorthogonal to each other are an X axis and a Y axis, a coordinate axisorthogonal to the display surface is a Z axis, and a rotating directionaround the Z axis is a θz direction, the first position adjustingactuator moves the second plate in a direction along the X axis and theθz direction, the second position adjusting actuator moves the thirdplate in a direction along the Y axis, and the first elastic member iselastically deformable in the direction along the X axis.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram showing the configuration of a projectoraccording to an embodiment.

FIG. 2 is a perspective view showing disposition of a cross dichroicprism, a display panel, and the like.

FIG. 3 is a perspective view showing the exterior of an adjustingmechanism.

FIG. 4 is an exploded perspective view showing the configuration of theadjusting mechanism.

FIG. 5 is a perspective view showing the configuration of a first plate.

FIG. 6 is a perspective view showing the configuration of a secondplate.

FIG. 7 is a perspective view showing the configuration of a third plate.

FIG. 8 is a perspective view showing the configuration of a base.

FIG. 9 is a schematic sectional view showing the configuration of anactuator.

FIG. 10A is a schematic diagram showing a Z one-axis adjusting method.

FIG. 10B is a schematic diagram showing a θx one-axis adjusting method.

FIG. 10C is a schematic diagram showing a θy one-axis adjusting method.

FIG. 11A is a perspective view showing the third plate and the secondplate placed on the third plate.

FIG. 11B is a perspective view showing the third plate and the secondplate placed on the third plate.

FIG. 12A is a schematic plan view showing an X one-axis adjustingmethod.

FIG. 12B is a schematic plan view showing a θz one-axis adjustingmethod.

FIG. 13 is a perspective view showing the base and the third plateplaced on the base.

FIG. 14 is a schematic plan view showing a Y one-axis adjusting method.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

An embodiment of the present disclosure is explained below withreference to the drawings. The embodiment explained below is explanationof an example of the present disclosure. The present disclosure is notlimited to the embodiment explained below. Various modificationsimplemented in a range in which the gist of the present disclosure isnot changed are also included in the present disclosure. In the drawingsreferred to below, scales of members are differentiated from actualscales in order to show the members in recognizable sizes. In thedrawings referred to below, X, Y, and Z axes, which are coordinate axesorthogonal to one another, are added according to necessity.

1. Embodiment

In this embodiment, an adjusting mechanism included in a projectorincluding three liquid crystal panels functioning as display panels isexplained as an example. In the adjusting mechanism in this embodimentexplained below, a component that adjusts three axes of θx, θy, and Zand a component that adjusts three axes of Y, X, and θz are examples ofan adjusting mechanism according to the present disclosure.

1.1. Projector

The configuration of a projector according to this embodiment isexplained with reference to FIG. 1. FIG. 1 is a schematic diagramshowing the configuration of a projector 1 according to the embodiment.

As shown in FIG. 1, the projector 1 according to this embodimentincludes a light source device 10, which is an illumination opticalsystem, a color separation optical system 20, a relay optical system 30,a display panel for green 40G, a display panel for red 40R, and adisplay panel for blue 40B functioning as three display panels, whichare light modulating devices, an adjusting mechanism for blue 70 and anadjusting mechanism for red 80, a cross dichroic prism 50 functioning asa prism, which is a color combination optical system, and a projectionlens 60. These are housed in a main body section 2. In the followingexplanation, the display panel for green 40G, the display panel for red40R, and the display panel for blue 40B are sometimes collectivelysimply referred to as display panel 40 as well. Further, the adjustingmechanism for blue 70 on which the display panel for blue 40B is placedand the adjusting mechanism for red 80 on which the display panel forred 40R is placed are sometimes collectively simply referred to asadjusting mechanism 7 as well.

The display panel 40 modulates light emitted from alight source 11included in the light source device 10. Among a plurality of the displaypanels 40, the display panel for red 40R is mounted on the adjustingmechanism for red 80 and the position of the display panel for red 40Ris adjusted and the display panel for blue 40B is mounted on theadjusting mechanism for blue 70 and the position of the display panelfor blue 40B is adjusted. The display panel for green 40G is not mountedon the adjusting mechanism in this embodiment and is mounted on amounting member 90. The display panel for green 40G modulates greenlight G, the display panel for red 40R modulates red light R, and thedisplay panel for blue 40B modulates blue light B. The lights modulatedby the display panels 40 are combined by the cross dichroic prism 50 andprojected onto a projection target such as a not-shown screen from theprojection lens 60.

The light source device 10 includes the light source 11, a first lensarray 12, a second lens array 13, a polarization converter 14, and asuperimposing lens 15. In the first lens array 12 and the second lensarray 13, small lenses are arrayed in a matrix shape.

In the projector 1, a light source of a discharge type is adopted as thelight source 11. However, the type of the light source 11 is not limitedto this. A solid-state light source such as a light emitting diode or alaser may be adopted as the light source 11.

Light emitted from the light source 11 is divided into a plurality ofvery small partial light beams by the first lens array 12. Thepolarization converter 14 aligns nonpolarized light emitted from thelight source 11 into polarized light usable in the display panel 40. Thepartial light beams are superimposed on incident surfaces of threedisplay panels 40, which are illumination targets, by the second lensarray 13 and the superimposing lens 15. That is, an integratorillumination optical system, in which light emitted from the lightsource 11 illuminates the display panels 40, is formed by the first lensarray 12, the second lens array 13, and the superimposing lens 15.

The color separation optical system 20 includes a first dichroic mirror21, a second dichroic mirror 22, a reflection mirror 23, and fieldlenses 24 and 25. The color separation optical system 20 separates lightemitted from the light source device 10 into color lights of threecolors in wavelength regions different from one another. The colorlights of the three colors are the green light G, the red light R, andthe blue light B. The green light G is substantially green light, thered light R is substantially red light, and the blue light B issubstantially blue light.

The field lens 24 is disposed on an incident surface side of the displaypanel for red 40R. The field lens 25 is disposed on an incident surfaceside of the display panel for green 40G.

The first dichroic mirror 21 transmits the red light R and reflects thegreen light G and the blue light B. The red light R transmitted throughthe first dichroic mirror 21 is reflected by the reflection mirror 23and transmitted through the field lens 24 to illuminate the displaypanel for red 40R.

The field lens 24 condenses the red light R reflected by the reflectionmirror 23 and illuminates the display panel for red 40R. Like the fieldlens 24, the field lens 25 condenses the green light G reflected by thesecond dichroic mirror 22 and illuminates the display panel for green40G. At this time, the lights illuminating the display panel for green40G and the display panel for red 40R are respectively set to besubstantially parallel light beams.

The second dichroic mirror 22 transmits the blue light B and reflectsthe green light G. The green light G reflected by the first dichroicmirror 21 is reflected by the second dichroic mirror 22 and thereaftertransmitted through the field lens 25 to illuminate the display panelfor green 40G.

The first dichroic mirror 21 and the second dichroic mirror 22 aremanufactured by forming dielectric multilayer films corresponding to thefunctions on transparent glass plates.

The relay optical system 30 includes an incident-side lens 31, a firstreflection mirror 32, a relay lens 33, a second reflection mirror 34,and an emission-side lens 35 functioning as a field lens. A light beamof the blue light B tends to be larger because the blue light B has alonger optical path compared with the green light G and the red light R.Accordingly, expansion of the light beam is suppressed using the relaylens 33. The blue light B emitted from the color separation opticalsystem 20 is reflected by the first reflection mirror 32 and convergedby the incident-side lens 31 near the relay lens 33. The blue light Bdiverges toward the second reflection mirror 34 and the emission-sidelens 35.

The emission-side lens 35 has the same function as the function of thefield lenses 24 and 25 explained above and illuminates the display panelfor blue 40B. The light illuminating the display panel for blue 40B isset to be a substantially parallel light beam.

The display panel 40 functions as a light modulating device in theprojector 1. A liquid crystal panel of a transmission type is adopted asthe display panel 40. In this case, an incident-side polarizing plateand an emission-side polarizing plate are usually provided in additionto the liquid crystal panel functioning as the display panel 40.Although not illustrated, the incident-side polarizing plate only has tobe fixed on a light incident side of the liquid crystal panel. Apolarizing plate 405 shown in FIG. 8 corresponds to the emission-sidepolarizing plate.

The display panel 40 functioning as the light modulating device is notlimited to the liquid crystal panel of the transmission type. A lightmodulating device of a reflection type such as a reflection-type liquidcrystal panel may be adopted as the light modulating device. A digitalmicromirror device (DMD) or the like that modulates light emitted fromthe light source 11 by controlling an emitting direction of incidentlight for each of micromirrors functioning as pixels may be adopted. Inthe digital micromirror device, a surface on which the micromirrors arearranged in a matrix shape is equivalent to a display surface. Further,the projector 1 is not limited to a configuration including a lightmodulating device for each of a plurality of color lights and may have aconfiguration for modulating the plurality of color lights in atime-division manner with one light modulating device. The adjustingmechanism 7 in this embodiment exerts more effects in positionadjustment of the plurality of display panels 40.

As explained above, among the plurality of display panels 40, thedisplay panel for blue 40B is mounted on the adjusting mechanism forblue 70 and the display panel for red 40R is mounted on the adjustingmechanism for red 80. The adjusting mechanism 7, that is, the adjustingmechanism for blue 70 and the adjusting mechanism for red 80 areexplained below.

The cross dichroic prism 50 combines converted lights of the colorsemitted from the plurality of display panels 40. Specifically, the crossdichroic prism 50 combines lights respectively emitted from the displaypanel for red 40R, the display panel for green 40G, and the displaypanel for blue 40B. The cross dichroic prism 50 includes a red-lightreflecting dichroic surface 51R that reflects the red light R and ablue-light reflecting dichroic surface 51B that reflects the blue lightB. A dielectric multilayer film that reflects the red light R isdisposed on the red-light reflecting dichroic surface 51R. A dielectricmultilayer film that reflects the blue light B is disposed on theblue-light reflecting dichroic surface 51B. The red-light reflectingdichroic surface 51R and the blue-light reflecting dichroic surface 51Bare hereinafter simply referred to as reflecting dichroic surfaces 51Rand 51B as well.

In plan view of the disposition of the color separation optical system20, the relay optical system 30, and the cross dichroic prism 50, thedielectric multilayer film that reflects the red light R and thedielectric multilayer film that reflects the blue light B are arrangedin a substantially X shape. The converted lights of the three colors ofthe red light R, the green light G, and the blue light B are combined bythe reflecting dichroic surfaces 51R and 51B and combined light fordisplaying a color image is generated. The combined light generated bythe cross dichroic prism 50 in this way is emitted toward the projectionlens 60.

The projection lens 60 is attached to the main body section 2. Thecombined light passed through the projection lens 60 and emitted fromthe main body section 2 is projected onto a projection target such as anot-shown screen as image light.

1.2. Adjusting Mechanism

The configuration of the adjusting mechanism according to thisembodiment is explained with reference to FIGS. 2, 3, and 4. FIG. 2 is aperspective view showing disposition of the cross dichroic prism 50, thedisplay panel 40, and the like. FIG. 3 is a perspective view showing theexterior of the adjusting mechanism 7. FIG. 4 is an exploded perspectiveview showing the configuration of the adjusting mechanism 7. In FIG. 2,to facilitate understanding of the disposition of the components, thedistance between the cross dichroic prism 50 and the three displaypanels 40 is shown larger than an actual distance. In FIG. 2, thedisposition of the display panel for blue 40B and the display panel forred 40R is reversed left and right from FIG. 1 with respect to the crossdichroic prism 50. Further, in FIGS. 3 and 4, among the adjustingmechanisms 7, the adjusting mechanism for blue 70 mounted with thedisplay panel for blue 40B is shown.

As shown in FIG. 2, the display panel for green 40G, the display panelfor blue 40B, and the display panel for red 40R are disposed in threedirections with respect to the cross dichroic prism 50. The displaypanel for blue 40B is mounted on the adjusting mechanism for blue 70.The display panel for red 40R is mounted on the adjusting mechanism forred 80. The display panel for green 40G is mounted on the mountingmember 90. The adjusting mechanism for blue 70 is located between thedisplay panel for blue 40B and the cross dichroic prism 50. Theadjusting mechanism for red 80 is located between the display panel forred 40R and the cross dichroic prism 50. The mounting member 90 islocated between the display panel for green 40G and the cross dichroicprism 50.

In the adjusting mechanism 7 and the mounting member 90, light blockingmembers are not interposed between the mounted display panels 40 and thecross dichroic prism 50. Accordingly, lights modulated by the displaypanels 40 are made incident on the cross dichroic prism 50 without beingblocked by the adjusting mechanism 7 and the mounting member 90. Thisform is seen, in FIG. 2, in the adjusting mechanism for red 80 in whichthe rear surface of the surface on which the display panel for red 40Ris placed is illustrated.

When, among the plurality of display panels 40, the display panel forgreen 40G is represented as a first display panel and the display panelfor blue 40B or the display panel for red 40R is represented as a seconddisplay panel, the second display panel is mounted on the adjustingmechanism 7 in this embodiment corresponding thereto. The position ofthe second display panel with respect to the first display panel isadjusted by the adjusting mechanism 7.

The adjusting mechanism for red 80 mounted with the display panel forred 40R has the same configuration as the configuration of the adjustingmechanism for blue 70. Accordingly, about the adjusting mechanism 7 inthis embodiment, in the following explanation, the adjusting mechanismfor blue 70 is explained as a representative example. Explanation of theadjusting mechanism for red 80 is omitted.

In this embodiment, the display panel for green 40G is not mounted onthe adjusting mechanism according to the present disclosure. However,the display panel for green 40G is not limited to this. The displaypanel for green 40G may be mounted on the adjusting mechanism accordingto the present disclosure instead of the mounting member 90. Themounting member 90 mounted with the display panel for green 40G mayinclude a focus adjusting mechanism for adjusting the distance betweenthe display panel for green 40G and the projection lens 60 shown in FIG.1.

As shown in FIG. 3, the adjusting mechanism for blue 70 includes a firststage 100, a second stage 200, a third stage 300, and a base 400. In astate in which the display panel for blue 40B is placed on a placingportion explained below, when a surface parallel to a display surface ofthe display panel for blue 40B is set as a reference plane, a coordinateaxis orthogonal to the reference plane is represented as a Z axis andcoordinate axes orthogonal to each other in the reference plane arerepresented as an X axis and a Y axis and a rotating direction aroundthe X axis is represented as a θx direction, a rotating direction aroundthe Y axis is represented as a θy direction, and a rotating directionaround the Z axis is represented as a θz direction. Further, + or −signs shown in the figures are added to respective directions along theX axis, the Y axis, and the Z axis, the respective + directions arerepresented as positive directions and the respective − directions arerepresented as negative directions. In the following explanation, therespective directions along the X axis, the Y axis, and the Z axis aresimply referred to as X direction, Y direction, and Z direction as well.

The adjusting mechanism for blue 70 has an elongated rectangular shapealong the Y axis in plan view from the positive Z direction. The base400 side, in other words, the negative Z-direction side of the adjustingmechanism for blue 70 is fixed to the cross dichroic prism 50 shown inFIG. 2.

The display panel for blue 40B is mounted closer to the positive Ydirection from the center in the Y direction, which is the longitudinaldirection in the adjusting mechanism for blue 70, in the plan view. Thedisplay panel for blue 40B is rectangular. Among four sides forming therectangle, two sides are disposed along the Y axis and the other twosides are disposed along the X axis.

As shown in FIG. 4, the adjusting mechanism for blue 70 includes thefirst stage 100 including a placing portion explained below on which thedisplay panel for blue 40B is placed, the second stage 200 that supportsthe first stage 100, the third stage 300 that supports the second stage200, and the base 400 that supports the third stage 300. The first stage100, the second stage 200, the third stage 300, and the base 400 aresuperimposed in the negative Z direction in this order. Therefore, amongthe first stage 100, the second stage 200, and the third stage 300, thethird stage 300 is located on the nearest side to the cross dichroicprism 50 explained above and the first stage 100 is located on thefarthest side from the cross dichroic prism 50.

The first stage 100 includes a first plate 101 on which the displaypanel for blue 40B is placed and a first actuator 110. The firstactuator 110 includes three actuators 111, 112, and 113. The firstactuator 110 comes into contact with the first plate 101 and moves thefirst plate 101 in the positive and negative Z directions, the θxdirection, and the θy direction. The first actuator 110 is equivalent toa first position adjusting actuator.

The second stage 200 includes a substantially flat second plate 201 onwhich the first plate 101 is placed and a second actuator 210. Thesecond actuator 210 includes actuators 211 and 212. The second actuator210 moves the second plate 201 in the positive and negative X directionsand the θz direction. In this specification, it is assumed that changesin postures such as rotations in the θx direction, the θy direction, andthe θz direction are also included in the movement. The second actuator210 is equivalent to a second position adjusting actuator.

The third stage 300 includes a substantially flat third plate 301 onwhich the second plate 201 is placed and a third actuator 310. The thirdactuator 310 moves the third plate 301 in the positive and negative Ydirections. The third actuator 310 is equivalent to a third positionadjusting actuator.

The third plate 301 is placed on the base 400. The negative Z-directionside of the base 400 is fixed to the cross dichroic prism 50 shown inFIG. 2.

The actuators 111, 112, and 113 functioning as the first actuator 110are mounted on the second plate 201 and are in contact with the firstplate 101. The actuators 211 and 212 functioning as the second actuator210 are mounted on the surface on the negative Z-direction side of thethird plate 301. The third actuator 310 is mounted on the base 400.Details of the first actuator 110, the second actuator 210, and thethird actuator 310 are explained below.

Detailed configurations of the first stage 100, the second stage 200,the third stage 300, and the base 400 are explained with reference toFIGS. 5, 6, 7, and 8. FIG. 5 is a perspective view showing theconfiguration of the first plate 101. FIG. 6 is a perspective viewshowing the configuration of the second plate 201. FIG. 7 is aperspective view showing the configuration of the third plate 301. FIG.8 is a perspective view showing the configuration of the base 400.

For convenience of illustration, FIG. 6 shows a state in which theactuators 111, 112, and 113 are mounted on the second plate 201. FIG. 7shows a state in which the actuators 211 and 212 are mounted on thethird plate 301. FIG. 8 shows a state in which the third actuator 310 ismounted on the base 400.

As shown in FIG. 5, the first plate 101 is substantially oblong. Thelong side of the first plate 101 is disposed along the Y axis and theshort side of the first plate 101 is disposed along the X axis. Thefirst plate 101 includes a placing portion 71, a spring member 76, and apair of spring members 77. The display panel for blue 40B is placed onthe placing portion 71.

The spring member 76 and the pair of spring members 77 are coil springsmade of metal. One end of the spring member 76 is fixed to the negativeZ-direction side at a positive Y-direction end portion of the firstplate 101. The pair of spring members 77 is disposed side by side alongthe positive and negative X directions. The pair of spring members 77 ispresent in the negative Y-direction side across the placing portion 71with respect to the spring member 76. One ends of the pair of springmembers 77 are fixed to the negative Z-direction side in the first plate101.

The other ends of the spring member 76 and the pair of spring members 77are respectively fixed to the surface on the negative Z-direction sidein the base 400 via opening sections explained below of the second plate201, the third plate 301, and the base 400. Accordingly, the first plate101 and the base 400 are coupled by the spring member 76 and the pair ofspring members 77. The second plate 201 and the third plate 301 are heldbetween the first plate 101 and the base 400. At this time, tensileloads of the spring member 76 and the pair of spring members 77 are setsuch that the first plate 101, the second plate 201, and the third plate301 are movable with respect to the base 400.

As shown in FIG. 6, the second plate 201 is substantially oblong. Thelong side of the second plate 201 is disposed along the Y axis and theshort side of the second plate 201 is disposed along the X axis. Thesecond plate 201 includes a first elastic member 231, a coupling section241, opening sections 276 and 281, and a pair of opening sections 277.The first elastic member 231 couples the second plate 201 and the thirdplate 301. The actuators 111, 112, and 113 functioning as the firstactuator 110 are disposed to pierce through the second plate 201 in thepositive and negative Z directions.

The first elastic member 231 is a single-plate leaf spring, thelongitudinal direction of which extends along the Y axis. The widthdirection of the first elastic member 231 is arranged along the Z axisand the thickness direction of the first elastic member 231 is arrangedalong the X axis. The length in the longitudinal direction of the firstelastic member 231 is shorter than the long side and is longer than theshort side of the second plate 201. With the disposition explainedabove, the first elastic member 231 is elastically deformable in thepositive and negative X directions. The substantial center in thelongitudinal direction of the first elastic member 231 is coupled andfixed to the second plate 201 via the coupling section 241. Both the endportions in the longitudinal direction of the first elastic member 231are coupled to the third plate 301 via a contact portion explained belowof the third plate 301. Consequently, the first elastic member 231couples the second plate 201 and the third plate 301.

At this time, the first elastic member 231 is disposed near the longside on the positive X-direction side of the second plate 201. The firstplate 101 is laid on the second plate 201 avoiding the first elasticmember 231. In this way, the first elastic member 231 is disposed in aminimum setting space.

In this embodiment, the single-plate leaf spring, a so-called thin leafspring is used as the first elastic member 231. However, the firstelastic member 231 is not limited to this. Other elastic members such asother leaf springs such as a laminated leaf spring, springs such as acoil spring and a disc spring, and a rubber material may be used as thefirst elastic member 231 if the first elastic member 231 couples thesecond plate 201 and the third plate 301 and is elastically deformablewith respect to the positive and negative X directions. Among theseelastic members, it is desirable to use the leaf spring from theviewpoint that a space required for setting is relatively small.

The opening section 281 is a substantially rectangular window piercingthrough the second plate 201. The opening section 281 is provided in aposition overlapping, in the plan view from the positive Z direction,the display panel for blue 40B placed on the placing portion 71 of thefirst plate 101. Accordingly, light modulated by the display panel forblue 40B is emitted without being blocked by the second plate 201.

In the first actuator 110, the actuator 111 functioning as the firstactuator is disposed on the positive Y-direction side, which is oneside, with respect to the opening section 281, in other words, theplacing portion 71 in the plan view from the positive Z direction. Inthe first actuator 110, the actuator 112 functioning as the secondactuator and the actuator 113 functioning as the third actuator aredisposed on the negative Y-direction side, which is the other side, withrespect to the placing portion 71 in the plan view from the positive Zdirection. In other words, the actuators 112 and 113 are located on theopposite side of the actuator 111 with respect to the placing portion71. The actuators 112 and 113 are disposed side by side along thepositive and negative X directions. That is, the actuator 111 and theactuators 112 and 113 are disposed to be opposed in the positive andnegative Y directions across the placing portion 71 in the plan viewfrom the positive Z direction.

The opening section 276 and the pair of opening sections 277 areopenings piercing through the second plate 201 and are formed largerthan a coil outer shape of the spring member 76 and the pair of springmembers 77. The opening section 276 is provided in a positioncorresponding to the spring member 76 in the plan view from the positiveZ direction. The pair of opening sections 277 is provided in positionscorresponding to the pair of spring members 77. Consequently, when theadjusting mechanism for blue 70 is assembled, the spring member 76 andthe pair of spring members 77 are disposed through the opening section276 and the pair of opening sections 277.

As shown in FIG. 7, the third plate 301 is substantially oblong. Thelong side of the third plate 301 is disposed along the Y axis and theshort side of the third plate 301 is disposed along the X axis. Thethird plate 301 includes a second elastic member 332 and a third elasticmember 333, a pair of contact portions 351 and 352, opening sections 381and 391, and a pair of opening sections 377 and 392. The actuators 211and 212 functioning as the second actuator 210 are disposed on thenegative Z-direction side of the third plate 301.

The contact portions 351 and 352 are rib-like protrusions projecting inthe positive Z direction from the substantially flat third plate 301.The contact portions 351 and 352 are provided at both the end portionsin the longitudinal direction, which is the positive and negative Ydirections, of the third plate 301. Specifically, the contact portion351 is provided on the positive Y-direction side and the contact portion352 is provided on the negative Y-direction side.

The contact portions 351 and 352 are paired. Both the end portions ofthe first elastic member 231 are respectively coupled to the contactportions 351 and 352. Consequently, the first elastic member 231 iscoupled to the third plate 301 via the pair of contact portions 351 and352. The first elastic member 231 is coupled to the second plate 201 viathe coupling section 241 present in a position sandwiched by the pair ofcontact portions 351 and 352 in the positive and negative Y directions.

The second elastic member 332 and the third elastic member 333 aresingle-plate leaf springs, the longitudinal direction of which extendsalong the X axis. The width direction of the second elastic member 332and the third elastic member 333 is disposed along the Z axis and thethickness direction of the second elastic member 332 and the thirdelastic member 333 is disposed along the Y axis. The second elasticmember 332 and the third elastic member 333 have substantially the sameshape. The length in the longitudinal direction of the second elasticmember 332 and the third elastic member 333 is shorter than the shortside of the third plate 301. With the disposition explained above, thesecond elastic member 332 and the third elastic member 333 areelastically deformed with respect to the positive and negative Ydirections.

The second elastic member 332 is disposed near the short side in thepositive Y-direction side in the third plate 301. One end of the secondelastic member 332 is coupled to the contact portion 351 and the otherend of the second elastic member 332 is coupled to coupling sectionsexplained below of the base 400. The third elastic member 333 isdisposed near the short side on the negative Y-direction side in thethird plate 301. One end of the third elastic member 333 is coupled tothe contact portion 352 and the other end of the third elastic member333 is coupled to the coupling sections explained below of the base 400.The second elastic member 332 and the third elastic member 333 areprovided substantially in parallel to be opposed in the positive andnegative Y directions. The second elastic member 332 and the thirdelastic member 333 couple the third plate 301 and the base 400 andrestrict movement of the third plate 301 with respect to the base 400 inthe positive and negative Y directions.

When the adjusting mechanism for blue 70 is assembled, the second plate201 is laid on the third plate 301 avoiding the second elastic member332 and the third elastic member 333. Accordingly, the second elasticmember 332 and the third elastic member 333 are disposed in a minimumsetting space.

In this embodiment, the single-plate leaf spring, a so-called thin leafspring is used as the second elastic member 332 and the third elasticmember 333. However, the second elastic member 332 and the third elasticmember 333 are not limited to this. The same elastic member as the firstelastic member 231 explained above may be used as the second elasticmember 332 and the third elastic member 333. It is desirable to use theleaf spring from the viewpoint that a space required for setting isrelatively small.

The opening section 381 is a substantially rectangular window piercingthrough the third plate 301. The opening section 381 is provided in aposition overlapping, in the plan view from the positive Z direction,the display panel for blue 40B placed on the placing portion 71 of thefirst plate 101. Accordingly, light modulated by the display panel forblue 40B is emitted without being blocked by the third plate 301.

The opening section 391 and the pairs of opening sections 377 and 392are openings piercing through the third plate 301. The opening section391 is provided in a position corresponding to the actuator 111 and thespring member 76 in the plan view from the positive Z direction. Theopening section 391 is formed larger than a shape obtained by combiningthe shape of a cross section parallel to an XY plane in the actuator 111and the coil outer shape of the spring member 76. Accordingly, when theadjusting mechanism for blue 70 is assembled, the opening section 391functions as a clearance for the actuator 111 and is capable of allowingthe spring member 76 to pass.

The pair of opening sections 377 is provided in positions correspondingto the pair of spring members 77 in the plan view from the positive Zdirection. The pair of opening sections 377 is formed larger than thecoil outer shape of the pair of spring members 77. Accordingly, when theadjusting mechanism for blue 70 is assembled, the pair of openingsections 377 is capable of respectively allowing the spring members 77to pass.

The pair of opening sections 392 is provided in positions correspondingto the actuators 112 and 113 in the plan view from the positive Zdirection. The pair of opening sections 392 is respectively formedlarger than the shapes of cross sections parallel to the XY plane in theactuators 112 and 113. Accordingly, when the adjusting mechanism forblue 70 is assembled, the pair of opening sections 392 functions asclearances for the actuators 112 and 113.

The actuators 211 and 212 are provided on the negative Z-direction sideof the third plate 301 and are paired. The pair of actuators 211 and 212is disposed to be opposed to the pair of contact portions 351 and 352and the first elastic member 231 in the positive and negative Xdirections in the plan view from the positive Z direction.

As shown in FIG. 8, the base 400 is substantially oblong. The long sideof the base 400 is disposed along the Y axis. The base 400 includescoupling sections 451 and 452, the polarizing plate 405, openingsections 491 and 494, and pairs of opening sections 477 and 492. Thethird actuator 310 is disposed to pierce through the base 400 in thepositive and negative Z directions.

The coupling sections 451 and 452 are columnar protrusions projecting inthe positive Z direction from the substantially flat base 400 and arepaired. The coupling sections 451 and 452 are present on the long sideon the negative X-direction side in the base 400 and provided at boththe end portions of the long side. Specifically, the coupling section451 is provided on the positive Y-direction side and the couplingsection 452 is provided on the negative Y-direction side. An end portionof the second elastic member 332 is coupled to the coupling section 451.An end portion of the third elastic member 333 is coupled to thecoupling section 452.

The polarizing plate 405 is provided in a position overlapping thedisplay panel for blue 40B in the plan view from the positive Zdirection. The polarizing plate 405 is an emission-side polarizingelement of the display panel for blue 40B. Light modulated by thedisplay panel for blue 40B is emitted via the polarizing plate 405.

The opening sections 491 and 494 and the pairs of opening sections 477and 492 are openings piercing through the base 400. The opening section491 is provided in a position corresponding to the actuators 111 and 211and the spring member 76 in the plan view from the positive Z direction.The opening section 491 is formed larger than a shape obtained bycombining the shape of cross sections parallel to the XY plane in theactuators 111 and 211 and the coil outer shape of the spring member 76.Accordingly, when the adjusting mechanism for blue is assembled, theopening section 491 functions as a clearance for the actuators 111 and211 and is capable of allowing the spring member 76 to pass.

The pair of opening sections 477 is provided in positions correspondingto the pair of spring members 77 in the plan view from the positive Zdirection. The pair of opening sections 477 is formed larger than thecoil outer shape of the pair of the spring members 77. Accordingly, whenthe adjusting mechanism for blue 70 is assembled, the pair of openingsections 477 is respectively capable of allowing the spring members 77to pass.

The pair of opening sections 492 is provided in positions correspondingto the actuators 112 and 113 in the plan view from the positive Zdirection. The pair of opening sections 492 is respectively formedlarger than the shape of cross sections parallel to the XY plane in theactuators 112 and 113. Accordingly, when the adjusting mechanism forblue 70 is assembled, the pair of opening sections 492 respectivelyfunctions as clearances for the actuators 112 and 113.

The opening section 494 is provided in a position corresponding to theactuator 212 in the plan view from the positive Z direction. The openingsection 494 is formed larger than the shape of a cross section parallelto the XY plane in the actuator 212. Accordingly, when the adjustingmechanism for blue 70 is assembled, the opening section 494 functions asthe actuator 212.

The configuration of the first actuator 110, the second actuator 210,and the third actuator 310 is explained with reference to FIG. 9. FIG. 9is a schematic sectional view showing the configuration of the actuator111. The first actuator 110, the second actuator 210, and the thirdactuator 310 have the same configuration, although parts and directionsin which the first actuator 110, the second actuator 210, and the thirdactuator 310 are disposed in the adjusting mechanism for blue 70 aredifferent. Accordingly, in FIG. 9, the actuator 111 in the firstactuator 110 is shown as a representative example. In FIG. 9, a crosssection parallel to a YZ plane and passing the center of a linearlymover explained below in the actuator 111 is shown.

As shown in FIG. 9, the actuator 111 includes a driving section 171, adisk member 173, a lead screw 175, a nut section 177, and a firstlinearly mover a11. The actuator 111 is a substantially rectangularparallelepiped and is a driving source for moving the position of thedisplay panel for blue 40B.

The nut section 177 is disposed substantially in the center of theactuator 111 in the plan view from the positive Z direction. A part ofthe nut section 177 projects from the surface on the positiveZ-direction side of the actuator 111. On the other hand, the negativeZ-direction side of the nut section 177 is sunk into the inside of theactuator 111. A columnar through-hole drilled in the positive andnegative Z directions is provided in the nut section 177. A female screwis provided on the inner surface on the negative Z-direction side in thethrough-hole.

The first linearly mover a11 is fit in the positive Z-direction side ofthe through-hole in the nut section 177. The positive Z-direction sideof the first linearly mover a11 projects from the nut section 177. Thatis, the distal end on the positive Z-direction side of the firstlinearly mover a11 projects to the positive Z-direction side of theactuator 111. A portion of the distal end projecting from the nutsection 177 in the first linearly mover a11 is larger than a portion ofthe first linearly mover a11 fit in the through-hole. Accordingly, thefirst linearly mover a11 does not further sink in the negative Zdirection with respect to the nut section 177 from a state illustratedin FIG. 9. The distal end of the first linearly mover a11 is formed as acurved surface and is in contact with the surface on the negativeZ-direction side in the first plate 101 shown in FIG. 4.

The lead screw 175 is disposed on the negative Z-direction side of thefirst linearly mover a11. The lead screw 175 has a shape rotationallysymmetrical with respect to a straight line parallel to the Z axis andincludes a shaft disposed along the Z axis. In the shaft, a brim sectionis provided substantially in the center in the positive and negative Zdirections. A male screw is provided on the positive Z-direction sidefrom the brim section. Consequently, the male screw of the lead screw175 and the female screw of the nut section 177 are screwed. A part ofthe shaft of the lead screw 175 is fit in the nut section 177.

The disk member 173 is fit and fixed in the positive Z-direction side ofthe brim section of the lead screw 175. The disk member 173 is a diskhaving a circular opening in the center in the plan view from thepositive Z direction. The shaft of the lead screw 175 pierces throughthe opening. The disk member 173 is disposed along the XY plane. Thecenter axis in the through-hole of the nut section 177 and arotationally symmetrical axis of the lead screw 175 and the disk member173 coincide. Accordingly, when the disk member 173 rotates around theaxis, the lead screw 175 also rotates. The male screw of the lead screw175 is screwed with the female screw of the nut section 177. Rotation ofthe nut section 177 synchronizing with the rotation of the lead screw175 is restricted. Therefore, the nut section 177 moves in the positiveand negative Z directions according to the rotation of the lead screw175.

In the plan view from the positive Z direction, the driving section 171is in contact with the vicinity of the outer circumference in the diskmember 173. The driving section 171 is a piezoelectric element. Avoltage is applied to the driving section 171, whereby an inversepiezoelectric effect is exerted. With the inverse piezoelectric effect,the disk member 173 receives a rotating force in the circumferentialdirection from the driving section 171. When the voltage is applied, thedriving section 171 is capable of rotating the disk member 173. When theapplied voltage is set to reverse potential, the driving section 171 isalso capable of reversely rotating the disk member 173. A signal wireand a power supply wire are coupled to the driving section 171. Thesignal wire is coupled to a not-shown control section of the projector1. The control section is, for example, a CPU (Central Processing Unit).The power supply wire is coupled to a not-shown power supply section ofthe projector 1.

With the configuration explained above, in the plan view from thepositive Z direction, when the driving section 171 rotates the diskmember 173 clockwise, the lead screw 175 also rotates in the samedirection. Accordingly, the nut section 177 moves in the positive Zdirection while the through-hole screws with the shaft of the lead screw175. Consequently, the nut section 177 projects together with the firstlinearly mover a11. That is, the operation of the driving section 171 iscontrolled, whereby a projection amount, in other words, a movementamount of the distal end of the first linearly mover a11 in the positiveZ direction changes.

On the other hand, in the plan view from the positive Z direction, whenthe driving section 171 rotates the disk member 173 counterclockwise,the lead screw 175 rotates in the same direction. Accordingly, the nutsection 177 moves in the negative Z direction while the through-holescrews with the shaft of the lead screw 175. Consequently, the nutsection 177 moves to sink into the actuator 111 together with the firstlinearly mover a11. That is, the operation of the driving section 171 iscontrolled, whereby the projection amount of the distal end of the firstlinearly mover a11 in the negative Z direction changes. Consequently,the first linearly mover a11 of the actuator 111 is capable of linearlymoving in the positive and negative Z directions.

In the first actuator 110, the second actuator 210, and the thirdactuator 310 other than the actuator 111, the action explained above isthe same and explanation of the action is omitted.

In this embodiment, the actuator 111 including the piezoelectric elementas the driving source is illustrated. However, the actuator 111 is notlimited to this. As the first actuator 110, the second actuator 210, andthe third actuator 310, a combination of an electromagnetic motor and aball screw, a voice coil motor, a solenoid actuator, and the like may beadopted.

As explained above, the adjusting mechanism for blue 70 has theconfiguration explained above. As explained above, the adjustingmechanism for red 80 mounted with the display panel for red 40R has thesame configuration as the configuration of the adjusting mechanism forblue 70. Therefore, explanation of the adjusting mechanism for red 80 isomitted.

1.3. Adjusting Method

A position adjusting method for the display panel 40 in the adjustingmechanism 7 is explained using the adjusting mechanism for blue 70 andthe display panel for blue 40B as an example. A position adjustingmethod for the display panel for red 40R in the adjusting mechanism forred 80 is the same as a position adjusting method for the display panelfor blue 40B in the adjusting mechanism for blue 70. Therefore,explanation of the position adjusting method for the display panel forred 40R is omitted.

1.3.1. Adjusting Method for Three Axes of θx, θy, and Z

An adjusting method for three axes of θx, θy, and Z in the first stage100 is explained with reference to FIGS. 10A, 10B, and 10C. FIG. 10A isa schematic diagram showing a Z one-axis adjusting method. FIG. 10B is aschematic diagram showing a θx one-axis adjusting method. FIG. 10C is aschematic diagram showing a θy one-axis adjusting method. In FIGS. 10A,10B, and 10C, only the second plate 201 and the first actuator 110mounted on the second plate 201 are illustrated. Illustration of theother components is omitted.

As shown in FIG. 10A, the three actuators 111, 112, and 113 functioningas the first actuator 110 are disposed at vertexes of a triangle acrossthe opening section 281 in the plan view from the positive Z direction.The actuator 111 functioning as the first actuator 110 includes thefirst linearly mover a11 that linearly moves in the direction along theZ axis. The actuator 112 functioning as the first actuator 110 includesa second linearly mover a12 that linearly moves in the direction alongthe Z axis. The actuator 113 functioning as the first actuator 110includes a third linearly mover a13 that linearly moves in the directionalong the Z axis. In the following explanation, the first linearly movera11, the second linearly mover a12, and the third linearly mover a13 aresometimes collectively simply referred to as linearly mover “a”.

In the actuators 111, 112, and 113, the distal ends of three linearlymovers “a” are disposed to face the positive Z direction. The distalends of the three linearly movers “a” come into contact with, from thenegative Z direction, which is a first direction, in the direction alongthe Z axis, the not-shown first plate 101 located on the positiveZ-direction side of the second plate 201. The linearly movers “a” of thethree actuators 111, 112, and 113 linearly move in the positive andnegative Z directions as explained above.

When the respective linearly movers “a” of the three actuators 111, 112,and 113 are linearly moved by an equal projection amount in the positiveand negative Z directions, the first plate 101, with which the linearlymovers “a” are in contact, moves in the positive and negative Zdirections with respect to the second plate 201. Consequently, it ispossible to perform position adjustment for Z one axis.

The three actuators 111, 112, and 113 are individually operable.Accordingly, it is also possible to individually change a projectionamount in the positive and negative Z directions in the three linearlymovers “a”.

As shown in FIG. 10B, the second linearly mover a12 of the actuator 112functioning as the second actuator and the third linearly mover a13 ofthe actuator 113 functioning as the third actuator are moved by an equalprojection amount in the positive and negative Z directions relativelyto the first linearly mover a11 of the actuator 111 functioning as thefirst actuator. Consequently, the first plate 101 moves in the θxdirection with respect to the second plate 201.

“Relatively to the first linearly mover a11 of the actuator 111”indicates any one of the following three cases: the first linearly movera11 is fixed and the second linearly mover a12 and the third linearlymover a13 are linearly moved; the second linearly mover a12 and thethird linearly mover a13 are linearly moved in the opposite direction ofa direction in which the first linearly mover a11 is linearly moved; andthe second linearly mover a12 and the third linearly mover a13 arelinearly moved by more than a projection amount of the first linearlymover a11 in the same direction as the direction in which the firstlinearly mover a11 is linearly moved.

It is more desirable to determine the projection amount according todistances and directions from the geometric center of the display panelfor blue 40B in the linearly movers “a” of the three actuators 111, 112,and 113, in other words, coordinate points of the linearly movers “a”.

Specifically, a triangle indicated by a broken line formed by contactsof the distal ends of the linearly movers “a” of the actuators 111, 112,and 113 and the first plate 101 is disposed along the XY plane. In theplan view from the positive Z direction, the geometrical center of thedisplay panel for blue 40B is located on the inner side of the trianglein the plan view from the positive Z direction. Movement in the θxdirection is rotation in the θx direction of the triangle. Therefore,when the second linearly mover a12 and the third linearly mover a13 arelinearly moved by an equal projection amount in the positive Zdirection, the movement in the θx direction is counterclockwise rotationwhen viewed from the negative X direction.

On the other hand, when the second linearly mover a12 and the thirdlinearly mover a13 are linearly moved by an equal projection amount inthe negative Z direction, the movement in the θx direction is clockwiserotation when viewed from the negative X direction. Consequently, it ispossible to perform position adjustment for θx one axis.

As shown in FIG. 10C, the second linearly mover a12 and the thirdlinearly mover a13 are linearly moved in directions opposite to eachother in the positive and negative Z directions relatively to the firstlinearly mover a11, whereby the first plate 101 moves in the θydirection with respect to the second plate 201. As explained above,“relatively to the first linearly mover a11” indicates a projectionamount of the second linearly mover a12 and the third linearly mover a13with respect to a projection amount of the first linearly mover a11 andis not limited to when the first linearly mover a11 is fixed.

Specifically, the movement in the θy direction is rotation in the θydirection of the triangle indicated by the broken line. That is, whenthe second linearly mover a12 is linearly moved in the negative Zdirection, which is the first direction, and the third linearly movera13 is linearly moved in the positive Z direction, which is a seconddirection opposite to the first direction, the movement in the θydirection is counterclockwise rotation when viewed from the positive Ydirection. This state is shown in FIG. 10C.

On the other hand, when the second linearly mover a12 is linearly movedin the positive Z direction and the third linearly mover a13 is linearlymoved in the negative Z direction, the movement in the θy direction isclockwise rotation when viewed from the positive Y direction.Consequently, it is possible to perform position adjustment for θy oneaxis.

The position adjustment for the three axes of θx, θy, and Z in the firstplate 101 is achieved by performing the Z one-axis adjustment, the θxone-axis adjustment, and the θy one-axis adjustment in combination. Thesecond plate 201 is coupled to the base 400 via the third plate 301shown in FIG. 4. The base 400 is fixed to the cross dichroic prism 50.Further, the cross dichroic prism 50 is fixed to the projection lens 60.

Therefore, the movement with respect to the second plate 201 in thefirst plate 101 explained above is movement with respect to the crossdichroic prism 50 and the projection lens 60. Consequently, the positionof the display panel for blue 40B mounted on the first plate 101 ismoved with respect to the cross dichroic prism 50 and the projectionlens 60 and the position adjustment for the three axes of θx, θy, and Zis achieved. In other words, the first plate 101 moves in the positiveand negative Z directions, the θx direction, and the θy direction,whereby the position of the display panel for blue 40B with respect tothe projection lens 60 changes. A focus of the projection lens 60 on thedisplay panel for blue 40B is adjusted.

1.3.2. Adjusting Method for Three Axes of Y, X, and θz

Adjustment of three axes of Y, X, and θz in the adjusting mechanism 7 inthis embodiment includes adjustment of two axes of X and θz between thesecond stage 200 and the third stage 300 and adjustment of one axis of Ybetween the third stage 300 and the base 400.

First, an adjustment method for the two axes of X and θz in the secondstage 200 and the third stage 300 is explained with reference to FIGS.11A, 11B, 12A, and 12B. FIGS. 11A and 11B are perspective views showingthe third plate 301 and the second plate 201 placed on the third plate301. FIG. 12A is a schematic plan view showing an X one-axis adjustingmethod. FIG. 12B is a schematic plan view showing a θz one-axisadjusting method. FIG. 11B shows a state in which the second plate 201and the third plate 301 are viewed from the negative Z-direction side,which is the rear surface side of FIG. 11A. In FIGS. 12A and 12B,components are schematically shown in the plan view from the positive Zdirection.

As shown in FIG. 11A, when the third plate 301 and the second plate 201are assembled, the coupling section 241 of the second plate 201 and thepair of contact portions 351 and 352 of the third plate 301 are coupledvia the first elastic member 231. As shown in FIG. 11B, the actuator 211functioning as the second actuator 210 includes a first linearly movera21 and the actuator 212 includes a second linearly mover a22. In otherwords, the second actuator 210 includes the first linearly mover a21 andthe second linearly mover a22. The first linearly mover a21 and thesecond linearly mover a22 come into contact with the second plate 201.

In an initial state in which the first linearly mover a21 and the secondlinearly mover a22 of the second actuator 210 are not linearly moving, apreload is applied to the first elastic member 231 in the positive Xdirection, which is one direction along the X axis. Specifically, thesubstantial center in the longitudinal direction of the first elasticmember 231 is coupled to the coupling section 241. Both the end portionsin the longitudinal direction of the first elastic member 231 arerespectively coupled to the contact portions 351 and 352. In the firstelastic member 231, a position coupled to the coupling section 241 iscloser to the positive X direction than positions coupled to the contactportions 351 and 352 when viewed from the positive Y direction.Accordingly, in the plan view from the positive Z direction, the firstelastic member 231 is disposed to be bent in a convex shape in thepositive X direction with a vertex set in a position coupled to thecoupling section 241.

As shown in FIG. 11B, a projecting section 261 of the second plate 201is disposed to project in the negative Z direction from the openingsection 391 of the third plate 301. A projecting section 262 of thesecond plate 201 is disposed to project in the negative Z direction froman opening section 393 of the third plate 301.

The first linearly mover a21 and the second linearly mover a22 aredisposed to face the positive X direction and come into contact with thesecond plate 201. Specifically, the first linearly mover a21 of theactuator 211 comes into contact with the projecting section 261 of thesecond plate 201 from the negative X direction, which is the otherdirection along the X axis. The second linearly mover a22 of theactuator 212 comes into contact with the projecting section 262 of thesecond plate 201 from the negative X direction.

The first linearly mover a21 and the second linearly mover a22 projectin the positive X direction to thereby press the second plate 201 in thepositive X direction via the projecting sections 261 and 262. In theplan view from the positive Z direction, the opening sections 391 and393 are formed in sizes for enabling the projecting sections 261 and 262to move in the positive and negative X directions by being pressed bythe first linearly mover a21 and the second linearly mover a22.

As shown in FIG. 12A, in the plan view from the positive Z direction,the first elastic member 231 and the pair of actuators 211 and 212 aredisposed to be opposed in the positive and negative X directions. Whenthe first linearly mover a21 and the second linearly mover a22 linearlymove in the positive X direction by an equal projection amount and pressthe projecting sections 261 and 262, projection amounts of the firstlinearly mover a21 and the second linearly mover a22 are equal.Accordingly, the second plate 201 moves in the positive X directionresisting elastic repulsion of the first elastic member 231.

On the other hand, when the projection amounts of the first linearlymover a21 and the second linearly mover a22 are attenuated from thestate in which the second plate 201 moves in the positive X direction,the second plate 201 moves in the negative X direction with the elasticrepulsion of the first elastic member 231. Consequently, the secondplate 201 moves in the positive and negative X directions with respectto the third plate 301. Consequently, it is possible to perform theposition adjustment for the X one axis.

Since the preload is applied to the first elastic member 231 in thepositive X direction, a backlash in the first elastic member 231decreases compared with when the preload is not applied. Consequently,it is possible to improve responsiveness of the movement of the secondplate 201 with respect to the linear movement, that is, the projectionof the first linearly mover a21 and the second linearly mover a22.

The pair of actuators 211 and 212 is individually operable. Accordingly,it is also possible to individually set the projection amounts in thepositive and negative X directions in the first linearly mover a21 andthe second linearly mover a22.

When the projection amount in the positive and negative X directions ofthe first linearly mover a21 and the projection amount in the positiveand negative X directions of the second linearly mover a22 aredifferentiated, the second plate 201 moves in the clockwise orcounterclockwise θz direction with respect to the third plate 301.

Specifically, as shown in FIG. 12B, when the actuator 211 is fixed andis not operated and the second linearly mover a22 of the actuator 212 islinearly moved in the positive X direction, the second linearly movera22 of the actuator 212 presses the second plate 201 in the positive Xdirection via the projecting section 262. Consequently, the second plate201 moves in the counterclockwise θz direction with respect to the thirdplate 301 in the plan view from the positive Z direction.

On the other hand, when the actuator 212 is fixed and is not operatedand the first linearly mover a21 of the actuator 211 is linearly movedin the positive X direction, the first linearly mover a21 of theactuator 211 presses the second plate 201 in the positive X directionvia the projecting section 261. Consequently, the second plate 201 movesin the clockwise θz direction with respect to the third plate 301 in theplan view from the positive Z direction. Consequently, it is possible toperform the position adjustment for the θz one axis.

A method of differentiating the projection amount in the positive andnegative X directions of the first linearly mover a21 and the projectionamount in the positive and negative X directions of the second linearlymover a22 is not limited to not operating one of the actuators 211 and212. To differentiate the two projection amounts, both of the actuators211 and 212 may be operated to differentiate the projection amounts.

An adjusting method for Y one axis in the third stage 300 and the base400 is explained with reference to FIGS. 13 and 14. FIG. 13 is aperspective view showing the base 400 and the third plate 301 placed onthe base 400. FIG. 14 is a schematic plan view showing the Y one-axisadjusting method. In FIG. 14, components are schematically shown in theplan view from the positive Z direction.

As shown in FIG. 13, when the base 400 and the third plate 301 areassembled, the contact portion 351 and the coupling section 451 arecoupled and the contact portion 352 and the coupling section 452 arecoupled via the second elastic member 332 and the third elastic member333. Consequently, the second elastic member 332 and the third elasticmember 333 couple the base 400 and the third plate 301 and restrict themovement of the third plate 301 with respect to the base 400 in thepositive and negative Y directions.

A preload is applied to the second elastic member 332 in the positive Ydirection in an initial state in which the third plate 301 is notpressed by the third actuator 310. Specifically, when viewed from thenegative X direction, a position to which one end of the second elasticmember 332 is coupled in the contact portion 351 is closer to thepositive Y direction than a position to which the other end of thesecond elastic member 332 is coupled in the coupling section 451.

A preload is applied to the third elastic member 333 in the positive Ydirection in an initial state in which the third plate 301 is notpressed by the third actuator 310. Specifically, when viewed from thenegative X direction, a position to which one end of the third elasticmember 333 is coupled in the contact portion 352 is closer to thepositive Y direction than a position to which the other end of the thirdelastic member 333 is coupled in the coupling section 452.

The second elastic member 332 and the third elastic member 333 aredisposed to be bent in a substantial S shape in the plan view from thepositive Z direction in the initial state by the preload.

As shown in FIG. 14, in the plan view from the positive Z direction, alinearly mover a31 of the third actuator 310 is disposed to be linearlymovable in the positive and negative Y directions. When the linearlymover a31 comes into contact with and presses the third plate 301 fromthe negative Y direction, the third plate 301 moves in the positive Ydirection resisting elastic repulsion of the second elastic member 332and the third elastic member 333.

On the other hand, when the projection of the linearly mover a31 in thethird actuator 310 is attenuated from the state in which the third plate301 moves in the positive Y direction, the third plate 301 moves in thenegative Y direction with the elastic repulsion of the second elasticmember 332 and the third elastic member 333. Consequently, the thirdplate 301 moves in the positive and negative Y directions with respectto the base 400. Consequently, it is possible to perform the positionadjustment for Y one axis.

Since the preload is applied to the second elastic member 332 and thethird elastic member 333 in the positive Y direction, a backlash in thesecond elastic member 332 and the third elastic member 333 decreasescompared with when the preload is not applied. Consequently, it ispossible to improve responsiveness of the movement of the third plate301 with respect to the linear movement of the linearly mover a31.

The position adjustment for the three axes of Y, X, and θz in the secondplate 201 is achieved by performing the Y one-axis adjustment, the Xone-axis adjustment, and the θz one-axis adjustment in combination. Thedisplay panel for blue 40B is mounted on the second plate 201 via thefirst plate 101. Accordingly, the position adjustment for the three axesof Y, X, and θz of the display panel for blue 40B is achieved withrespect to the base 400. That is, the position of the display panel forblue 40B is moved with respect to the cross dichroic prism 50 and theprojection lens 60 and the position adjustment for the three axes of Y,X, and θz is achieved. Consequently, pixel deviation adjustment betweenthe display panel for blue 40B and the other display panels 40 isachieved.

With the configuration of the adjusting mechanism for blue 70 explainedabove, the position of the display panel for blue 40B can be adjusted inthe six axes of θx, θy and Z and Y, X, and θz. As explained above, theadjusting mechanism for red 80 mounted with the display panel for red40R has the same configuration as the configuration of the adjustingmechanism for blue 70. Accordingly, the position of the display panelfor blue 40B can also be adjusted in the six axes of θx, θy and Z and Y,X, and θz by the adjusting mechanism for red 80.

Therefore, the position of the display panel for red 40R changesaccording to the movement of the first plate 101, the second plate 201,and the third plate not shown in the figures in the adjusting mechanismfor red 80. The position of the display panel for blue 40B changesaccording to the movement of the first plate 101, the second plate 201,and the third plate 301 in the adjusting mechanism for blue 70.Consequently, in the projector 1, the display panel for red 40R and thedisplay panel for blue 40B are positioned with respect to the displaypanel for green 40G. It is possible to perform focus adjustment andpixel deviation adjustment.

In this embodiment, the configuration is illustrated in which the firststage 100 for performing θxθyZ three-axis adjustment, the second stage200 for performing Xθz two-axis adjustment, and the third stage 300 forperforming Y one-axis adjustment are disposed in this order from thedisplay panel for blue 40B toward the base 400. However, the dispositionof the stages is not limited to this.

As explained above, with the adjusting mechanism 7 and the projector 1according to this embodiment, the following effects can be obtained.

The positions of the display panel for blue 40B and the display panelfor red 40R in the projector 1 can be adjusted in the six axes of θx, θyand Z and Y, X, and θz.

The three axes of θx, θy and Z are adjusted by the first stage 100. Afocus of the projection lens 60 on the display panel for blue 40B can beadjusted. The three axes of Y, X, and θz are adjusted by the secondstage 200 and the third stage 300. Pixel deviation between the displaypanel for blue 40B and the other display panels 40 can be adjusted.Therefore, it is possible to provide the projector 1 capable ofperforming focus adjustment and pixel deviation adjustment for thedisplay panel 40.

Since the first plate 101 is disposed closer to the display panel forblue 40B than the second plate 201 and the third plate 301, even if thepixel deviation is adjusted in the three axes of Y, X, and θz, a focusfor the three axes of θx, θy and Z does not deviate. That is, it ispossible to respectively independently perform the focus adjustment andthe pixel deviation adjustment.

When not only adjustment in a manufacturing process but also the focusadjustment and the pixel deviation adjustment are necessary because ofthe influence of aged deterioration, an environment of use, and thelike, it is possible to perform the adjustment using the adjustingmechanism 7. That is, it is possible to satisfactorily maintain, for along period, the quality of an image and the like projected from theprojector 1.

The positions of the display panel for red 40R and the display panel forblue 40B are adjusted with respect to the display panel for green 40G.That is, in the projector 1 including the three display panels 40, thatis, the display panel for green 40G, the display panel for red 40R, andthe display panel for blue 40B, it is possible to adjust positions basedon the display panel for green 40G.

The adjusting mechanism 7 adopts the leaf springs as the first elasticmember 231, the second elastic member 332, and the third elastic member333. Therefore, a guide is unnecessary. Consequently, it is possible toreduce the thickness in the positive and negative Z directions in theadjusting mechanism 7.

The first actuator 110, the second actuator 210, and the third actuator310 adopt the piezoelectric element as the driving section 171.Accordingly, it is easy to reduce the actuators in size and weight.Therefore, the adjusting mechanism 7 can be reduced in size and weight,although the adjusting mechanism 7 includes a plurality of actuators. Itis also easy to reduce projector 1 in size and weight.

Contents derived from the embodiment are described below.

An adjusting mechanism is an adjusting mechanism for adjusting aposition of a display panel, the adjusting mechanism including: a firstplate including a placing portion on which the display panel is placed;a second plate on which the first plate is placed, the second platebeing disposed on an opposite side of the display panel side withrespect to the first plate; a third plate on which the second plate isplaced, the third plate being disposed on an opposite side of the firstplate side with respect to the second plate; a first position adjustingactuator; a second position adjusting actuator; and a third positionadjusting actuator. In a state in which the display panel is placed onthe placing portion, when a surface parallel to a display surface of thedisplay panel is set as a reference plane and a coordinate axisorthogonal to the reference plane is represented as a Z axis andcoordinate axes orthogonal to each other in the reference plane arerepresented as an X axis and a Y axis and a rotating direction aroundthe X axis is represented as a θx direction, a rotating direction aroundthe Y axis is represented as a θy direction, and a rotating directionaround the Z axis is represented as a θz direction, the first positionadjusting actuator moves the first plate in a direction along the Zaxis, the θx direction, and the θy direction, the second positionadjusting actuator moves the second plate in a direction along the Xaxis and the θz direction, and the third position adjusting actuatormoves the third plate in a direction along the Y axis.

With this configuration, it is possible to adjust the position of thedisplay panel in six axes. Specifically, θxθyZ three-axis adjustment inthe display panel is achieved by the first plate and the first positionadjusting actuator. YXθz three-axis adjustment in the display panel isachieved by the second plate and the second position adjusting actuatorand the third plate and the third position adjusting actuator.Therefore, it is possible to provide the adjusting mechanism thatadjusts the position of the display panel in the projector in the sixaxes.

Since the first plate is disposed closer to the display panel than thesecond plate and the third plate, the three axes of θx, θy, and Z do notdeviate even if the three axes of Y, X, and θz are adjusted. That is, itis possible to respectively independently perform the θxθyZ three-axisadjustment and the YXθz three-axis adjustment.

In the adjusting mechanism, the first position adjusting actuator mayinclude a first actuator, a second actuator, and a third actuator, thefirst actuator may include a first linearly mover configured to linearlymove in the direction along the Z axis, the second actuator may includea second linearly mover configured to linearly move in the directionalong the Z axis, the third actuator may include a third linearly moverconfigured to linearly move in the direction along the Z axis, the firstactuator may be disposed on one side with respect to the placingportion, and the second actuator and the third actuator may be disposedon another side opposite to the first actuator side with respect to theplacing portion.

With this configuration, it is possible to adjust the position of thedisplay panel in three axes. Specifically, the three actuators includingthe first actuator, the second actuator, and the third actuator aredisposed at vertexes of a triangle surrounding the placing portion.Accordingly, the first linearly mover, the second linearly mover, andthe third linearly mover of the three actuators are individuallyoperated, whereby relative movement amounts of the three actuatorschange. The positions of the plates and the placing portion are adjustedand three-axis adjustment of the position of the display panel isachieved. Therefore, it is possible to provide the adjusting mechanismfor adjusting the position of the display panel in the projector or thelike in three axes.

In the adjusting mechanism, the first linearly mover, the secondlinearly mover, and the third linearly mover may come into contact withthe first plate from the direction along the Z direction.

With this configuration, it is possible to adjust the position of thedisplay panel in the three axes including the Z axis.

In the adjusting mechanism, the first actuator, the second actuator, andthe third actuator may be disposed to be opposed to one another in thedirection along the Y axis across the placing portion, and the firstplate may move in the direction along the Z direction when the firstlinearly mover, the second linearly mover, and the third linearly moverare linearly moved in a same direction along the Z axis.

With this configuration, the first linearly mover, the second linearlymover, and the third linearly mover of the three actuators areindividually linearly moved to change relative movement amounts in thethree actuators. That is, it is possible to adjust the position of thedisplay panel in the direction along the Z axis.

In the adjusting mechanism, the first plate may move in the θx directionwhen the second linearly mover and the third linearly mover arerelatively linearly moved in a same direction along the Z axis withrespect to the first linearly mover.

With this configuration, the first linearly mover, the second linearlymover, and the third linearly mover of the three actuators areindividually linearly moved to change relative movement amounts in thethree actuators. That is, it is possible to adjust the position of thedisplay panel in the θx direction.

In the adjusting mechanism, the first plate may move in the θy directionwhen the second linearly mover is relatively linearly moved along afirst direction along the Z direction with respect to the first linearlymover and the third linearly mover is relatively linearly moved along asecond direction opposite to the first direction along the Z axis withrespect to the first linearly mover.

With this configuration, the first linearly mover, the second linearlymover, and the third linearly mover of the three actuators areindividually linearly moved to change relative movement amounts. Thatis, it is possible to adjust the position of the display panel in the θydirection.

In the adjusting mechanism, the adjusting mechanism may further includea first elastic member coupling the second plate and the third plate,and the first elastic member may be elastically deformable in thedirection along the X axis.

With this configuration, it is possible to adjust the position of thedisplay panel in the three axes of Y, X, and θz. Specifically, Xθztwo-axis adjustment in the display panel is achieved by the second plateand the second position adjusting actuator. Y one-axis adjustment in thedisplay panel is achieved by the third plate and the third positionadjusting actuator. Therefore, it is possible to provide the adjustingmechanism for adjusting the position of the display panel in theprojector or the like in three axes.

In the adjusting mechanism, the adjusting mechanism may further include:abase on which the third plate is placed, the base being disposed on anopposite side of the second plate side with respect to the third plate;and a second elastic member and a third elastic member provided to beopposed to each other in the direction along the Y axis, coupling thethird plate and the base, and configured to restrict movement of thethird plate in the direction along the Y axis with respect to the base.

With this configuration, when the third position adjusting actuator isoperated to move the third plate, it is possible to move the third plateonly in the direction along the Y axis. Compared with when a movingdirection of the third plate is restricted using a guide, a space forsetting the guide is unnecessary. It is possible to reduce the adjustingmechanism in size.

Further, the second elastic member and the third elastic member couplethe third plate and the base. Therefore, when the third plate movesaccording to the operation of the third position adjusting actuator, arepulsive force is contained in the second elastic member and the thirdelastic member. Accordingly, when the operation of the third positionadjusting actuator is released or an operation amount of the thirdposition adjusting actuator is attenuated, the repulsive force acts toreturn the third plate to a position before the operation of the thirdposition adjusting actuator. Consequently, it is possible to cause thethird plate to reciprocate in the direction along the Y axis withrespect to the base.

In the adjusting mechanism, the second position adjusting actuator mayinclude a first actuator and a second actuator, the first actuator mayinclude a first linearly mover configured to linearly move in thedirection along the X axis, the second actuator may include a secondlinearly mover configured to linearly move in the direction along the Xaxis, and the first linearly mover and the second linearly mover maycome into contact with the second plate.

With this configuration, the second position adjusting actuator canbring the two linearly mover, that is, the first linearly mover and thesecond linearly mover, into contact with the second plate.

In the adjusting mechanism, the first linearly mover and the secondlinearly mover may project in the direction along the X axis to pressthe second plate.

With this configuration, the second position adjusting actuator canindividually project the first linearly mover and the second linearlymover to press the second plate in the direction along the X axis.

In the adjusting mechanism, the second plate may move in the directionalong the X axis when a projection amount of the first linearly mover inthe direction along the X axis and a projection amount of the secondlinearly mover in the direction along the X axis are equal.

With this configuration, it is possible to move the second plate in thedirection along the X axis with respect to the third plate. When thesecond plate moves according to the operation of the second positionadjusting actuator, a repulsive force is contained in the first elasticmember. Accordingly, when the operation of the second position adjustingactuator is released or a projection amount of the second positionadjusting actuator is attenuated, the repulsive force acts to return thesecond plate to a position before the operation of the second positionadjusting actuator. Consequently, it is possible to cause the secondplate to reciprocate in the direction along the X axis with respect tothe third plate.

In the adjusting mechanism, the second plate may move in the θzdirection when a projection amount of the first linearly mover in thedirection along the X axis and a projection amount of the secondlinearly mover in the direction along the X axis are different.

With this configuration, it is possible to move the second plate in bothclockwise and counterclockwise directions in the θz direction withrespect to the third plate.

In the adjusting mechanism, the first elastic member may be applied witha preload in the direction along the X axis.

With this configuration, since the preload is applied to the firstelastic member, a backlash in the first elastic member decreasescompared with when the preload is not applied. Consequently, it ispossible to improve responsiveness of the movement of the second platewith respect to the operation of the second position adjusting actuator.

In the adjusting mechanism, the third plate may include a pair ofcontact portions provided at both ends in the direction along the Yaxis, the first elastic member may be a leaf spring, the first elasticmember may be coupled to the third plate via the pair of contactportions and coupled to the second plate in a position of the firstelastic member between the pair of contact portions in the directionalong the Y axis, and the first actuator and the second actuator may bedisposed to be opposed to the pair of contact portions and the firstelastic member in the direction along the X axis.

With this configuration, it is easy to secure a space for mounting thedisplay panel between a pair of second position adjusting actuators andthe pair of contact portions and the first elastic member, which aredisposed to be opposed to each other. Since the first elastic member isthe leaf spring, a setting space of the first elastic member is smallcompared with other elastic members such as a coil spring. Consequently,it is possible to reduce the adjusting mechanism in size.

A projector according to an aspect includes: a light source; a displaypanel configured to modulate light emitted from the light source; aprojection lens configured to project the light modulated by the displaypanel; and the adjusting mechanism on which the display panel is placed.

In the projector, a focus of the projection lens with respect to thedisplay panel may be adjusted when the first plate moves in at least onedirection among the direction along the Z axis, the θx direction, andthe θy direction and changes a position of the display panel withrespect to the projection lens.

With these configurations, three axes of θx, θy, and Z are adjusted bythe first plate and the first position adjusting actuators. It ispossible to adjust a focus of the projection lens on the display panel.Three axes of Y, X, and θz are adjusted by the second plate and thesecond position adjusting actuator and the third plate and the thirdposition adjusting actuator. It is possible to adjust pixel deviation.Therefore, it is possible to provide a projector capable of performingfocus adjustment for the display panel and pixel deviation adjustment.

Since the first plate is disposed closer to the display panel than thesecond plate and the third plate, a focus for the three axes of θx, θy,and Z does not deviate even if pixel deviation is adjusted in the threeaxes of Y, X, and θz. That is, it is possible to respectivelyindependently perform the focus adjustment and the pixel deviationadjustment.

When the focus adjustment and the pixel deviation adjustment arenecessary because of the influence of aged deterioration, an environmentof use, and the like, it is possible to perform the adjustment using theadjusting mechanism. That is, it is possible to satisfactorily maintain,for a long period, the quality of an image and the like projected fromthe projector.

In the projector, the projector may further include, as the displaypanel, a display panel for green configured to modulate green light, adisplay panel for red configured to modulate red light, and a displaypanel for blue configured to modulate blue light and include, as theadjusting mechanism, an adjusting mechanism for red configured to adjusta position of the display panel for red and an adjusting mechanism forblue configured to adjust a position of the display panel for blue, andthe projector may determine a position of the display panel for red anda position of the display panel for blue with respect to the displaypanel for green by changing the position of the display panel for redaccording to movement of the second plate and the third plate in theadjusting mechanism for red and changing the position of the displaypanel for blue according to movement of the second plate and the thirdplate in the adjusting mechanism for blue.

With this configuration, the positions of the display panel for red andthe display panel for blue are adjusted with respect to the displaypanel for green. That is, in the projector including the three displaypanels, that is, the display panel for green, the display panel for red,and the display panel for blue, it is possible to adjust positions basedon the display panel for green.

In the projector, the projector may further include a color combinationoptical system configured to combine lights respectively emitted fromthe display panel for red, the display panel for green, and the displaypanel for blue, and, among the first plate, the second plate, and thethird plate, the third plate may be located on a nearest side to thecolor combination optical system and the first plate may be located on afarthest side from the color combination optical system.

With this configuration, the first plate is disposed further away fromthe color combination optical system than the second plate and the thirdplate. That is, the first plate can be disposed closer to the displaypanel than the second plate and the third plate. Consequently, even ifpixel deviation is adjusted in the three axes of Y, X, and θz, a focusfor the three axes of θx, θy, and Z does not deviate.

An adjusting mechanism according to an aspect is an adjusting mechanismfor adjusting a position of a display panel, the adjusting mechanismincluding: a plate including a placing portion on which the displaypanel is placed; a first actuator configured to come into contact withthe plate and move the plate; a second actuator configured to come intocontact with the plate and move the plate; and a third actuatorconfigured to come into contact with the plate and move the plate. Thefirst actuator includes a first linearly mover configured to linearlymove in a predetermined direction, the second actuator includes a secondlinearly mover configured to linearly move in the predetermineddirection, the third actuator includes a third linearly mover configuredto linearly move in the predetermined direction, the first actuator isdisposed on one side with respect to the placing portion, and the secondactuator and the third actuator are disposed on another side opposite tothe first actuator side with respect to the placing portion.

With this configuration, it is possible to adjust the position of thedisplay panel in three axes. Specifically, the first actuator, thesecond actuator, and the third actuator are disposed at vertexes of atriangle surrounding the placing portion. Accordingly, the firstlinearly mover, the second linearly mover, and the third linearly moverof the three actuators are individually operated, whereby relativemovement amounts in the three actuators change. The positions of theplates and the placing portion are adjusted and three-axis adjustment ofthe position of the display panel is achieved. Therefore, it is possibleto provide the adjusting mechanism for adjusting the position of thedisplay panel in the projector or the like in three axes.

An adjusting mechanism according to an aspect is an adjusting mechanismfor adjusting a position of a display panel, the adjusting mechanismincluding: a first plate including a placing portion on which thedisplay panel is placed; a second plate on which the first plate isplaced, the second plate being disposed on an opposite side of thedisplay panel side with respect to the first plate; a third plate onwhich the second plate is placed, the third plate being disposed on anopposite side of the first plate side with respect to the second plate;a first position adjusting actuator; a second position adjustingactuator; and a first elastic member coupling the second plate and thethird plate. When coordinate axes orthogonal to each other in a displaysurface of the display panel are represented as an X axis and a Y axis,a coordinate axis orthogonal to the display surface is represented as aZ axis, and a rotating direction around the Z axis is represented as aθz direction, the first position adjusting actuator moves the secondplate in a direction along the X axis and the θz direction, the secondposition adjusting actuator moves the third plate in a direction alongthe Y axis, and the first elastic member is elastically deformable inthe direction along the X axis.

With this configuration, it is possible to adjust the position of thedisplay panel in three axes of Y, X, and θz. Specifically, Xθz two-axisadjustment in the display panel is achieved by the second plate and thesecond position adjusting actuator. Y one-axis adjustment in the displaypanel is achieved by the third plate and the third position adjustingactuator. Therefore, it is possible to provide the adjusting mechanismfor adjusting the position of the display panel in the projector or thelike in three axes.

What is claimed is:
 1. An adjusting mechanism for adjusting a positionof a display panel, the adjusting mechanism comprising: a first plateincluding a placing portion on which the display panel is placed; asecond plate on which the first plate is placed, the second plate beingdisposed on an opposite side of a display panel side with respect to thefirst plate; a third plate on which the second plate is placed, thethird plate being disposed on an opposite side of a first plate sidewith respect to the second plate; a first position adjusting actuator; asecond position adjusting actuator; and a third position adjustingactuator, wherein: in a state in which the display panel is placed onthe placing portion, a surface parallel to a display surface of thedisplay panel is a reference plane, a coordinate axis orthogonal to thereference plane is a Z axis, two coordinate axes orthogonal to eachother in the reference plane are an X axis and a Y axis, a rotatingdirection around the X axis is a θx direction, a rotating directionaround the Y axis is a θy direction, and a rotating direction around theZ axis is a θz direction, the first position adjusting actuator isconfigured to move the first plate in a direction along the Z axis, theθx direction, and the θy direction, the second position adjustingactuator is configured to move the second plate in a direction along theX axis and the θz direction, and the third position adjusting actuatoris configured to move the third plate in a direction along the Y axis.2. The adjusting mechanism according to claim 1, wherein: the firstposition adjusting actuator includes a first actuator, a secondactuator, and a third actuator, the first actuator includes a firstlinearly mover configured to linearly move in the direction along the Zaxis, the second actuator includes a second linearly mover configured tolinearly move in the direction along the Z axis, the third actuatorincludes a third linearly mover configured to linearly move in thedirection along the Z axis, the first actuator is disposed on one sidewith respect to the placing portion, and the second actuator and thethird actuator are disposed on another side opposite to a first actuatorside with respect to the placing portion.
 3. The adjusting mechanismaccording to claim 2, wherein the first linearly mover, the secondlinearly mover, and the third linearly mover come into contact with thefirst plate from the direction along the Z direction.
 4. The adjustingmechanism according to claim 3, wherein the first actuator, the secondactuator, and the third actuator are disposed to be opposed to oneanother in the direction along the Y axis across the placing portion,and the first plate moves in the direction along the Z direction whenthe first linearly mover, the second linearly mover, and the thirdlinearly mover are linearly moved in a same direction along the Z axis.5. The adjusting mechanism according to claim 3, wherein the first platemoves in the θx direction when the second linearly mover and the thirdlinearly mover are relatively linearly moved in a same direction alongthe Z axis with respect to the first linearly mover.
 6. The adjustingmechanism according to claim 3, wherein the first plate moves in the θydirection when the second linearly mover is relatively linearly movedalong a first direction along the Z direction with respect to the firstlinearly mover and the third linearly mover is relatively linearly movedalong a second direction opposite to the first direction along the Zaxis with respect to the first linearly mover.
 7. The adjustingmechanism according to claim 1, further comprising a first elasticmember coupling the second plate and the third plate, wherein the firstelastic member is elastically deformable in the direction along the Xaxis.
 8. The adjusting mechanism according to claim 7, furthercomprising: a base on which the third plate is placed, the base beingdisposed on an opposite side of a second plate side with respect to thethird plate; and a second elastic member and a third elastic memberwhich are provided to be opposed to each other in the direction alongthe Y axis, the second elastic member and the third elastic member beingcoupling the third plate and the base, and configured to restrictmovement of the third plate in the direction along the Y axis withrespect to the base.
 9. The adjusting mechanism according to claim 7,wherein: the second position adjusting actuator includes a firstactuator and a second actuator, the first actuator includes a firstlinearly mover configured to linearly move in the direction along the Xaxis, the second actuator includes a second linearly mover configured tolinearly move in the direction along the X axis, and the first linearlymover and the second linearly mover come into contact with the secondplate.
 10. The adjusting mechanism according to claim 9, wherein thefirst linearly mover and the second linearly mover project in thedirection along the X axis to press the second plate.
 11. The adjustingmechanism according to claim 10, wherein the second plate moves in thedirection along the X axis when a projection amount of the firstlinearly mover in the direction along the X axis and a projection amountof the second linearly mover in the direction along the X axis aresubstantially equal.
 12. The adjusting mechanism according to claim 10,wherein the second plate moves in the θz direction when a projectionamount of the first linearly mover in the direction along the X axis anda projection amount of the second linearly mover in the direction alongthe X axis are different.
 13. The adjusting mechanism according to claim7, wherein the first elastic member is applied with a preload in thedirection along the X axis.
 14. The adjusting mechanism according toclaim 9, wherein: the third plate includes a pair of contact portionsprovided at both ends in the direction along the Y axis, the firstelastic member is a leaf spring, the first elastic member is coupled tothe third plate via the pair of contact portions and coupled to thesecond plate in a position of the first elastic member between the pairof contact portions in the direction along the Y axis, and the firstactuator and the second actuator are disposed to be opposed to the pairof contact portions and the first elastic member in the direction alongthe X axis.
 15. A projector comprising: a light source; a display panelconfigured to modulate light emitted from the light source; a projectionlens configured to project the light modulated by the display panel; andthe adjusting mechanism according to claim 1 on which the display panelis placed.
 16. The projector according to claim 15, wherein a focus ofthe projection lens with respect to the display panel is adjusted whenthe first plate moves in at least one direction among the directionalong the Z axis, the θx direction, and the θy direction and changes aposition of the display panel with respect to the projection lens. 17.The projector according to claim 15, further comprises: a display panelfor green configured to modulate green light as the display panel; adisplay panel for red configured to modulate red light as the displaypanel; a display panel for blue configured to modulate blue light as thedisplay panel; an adjusting mechanism for red configured to adjust aposition of the display panel for red as the adjusting mechanism; and anadjusting mechanism for blue configured to adjust a position of thedisplay panel for blue as the adjusting mechanism, wherein a position ofthe display panel for red and a position of the display panel for bluewith respect to the display panel for green are determined by changingthe position of the display panel for red according to movement of thesecond plate and the third plate in the adjusting mechanism for red andchanging the position of the display panel for blue according tomovement of the second plate and the third plate in the adjustingmechanism for blue.
 18. The projector according to claim 17, furthercomprising a color combination optical system configured to combinelights respectively emitted from the display panel for red, the displaypanel for green, and the display panel for blue, and among the firstplate, the second plate, and the third plate, the third plate out of thethree plates is located on a nearest side to the color combinationoptical system and the first plate out of the three plates is located ona farthest side from the color combination optical system.
 19. Anadjusting mechanism for adjusting a position of a display panel, theadjusting mechanism comprising: a plate including a placing portion onwhich the display panel is placed; a first actuator configured to comeinto contact with the plate and move the plate; a second actuatorconfigured to come into contact with the plate and move the plate; and athird actuator configured to come into contact with the plate and movethe plate, wherein: the first actuator includes a first linearly moverconfigured to linearly move in a predetermined direction, the secondactuator includes a second linearly mover configured to linearly move inthe predetermined direction, the third actuator includes a thirdlinearly mover configured to linearly move in the predetermineddirection, the first actuator is disposed on one side with respect tothe placing portion, and the second actuator and the third actuator aredisposed on another side opposite to a first actuator side with respectto the placing portion.
 20. An adjusting mechanism for adjusting aposition of a display panel, the adjusting mechanism comprising: a firstplate including a placing portion on which the display panel is placed;a second plate on which the first plate is placed, the second platebeing disposed on an opposite side of the display panel side withrespect to the first plate; a third plate on which the second plate isplaced, the third plate being disposed on an opposite side of a firstplate side with respect to the second plate; a first position adjustingactuator; a second position adjusting actuator; and a first elasticmember coupling the second plate and the third plate, wherein: in adisplay surface of the display panel, two coordinate axes orthogonal toeach other are an X axis and a Y axis, a coordinate axis orthogonal tothe display surface is a Z axis, and a rotating direction around the Zaxis is a θz direction, the first position adjusting actuator moves thesecond plate in a direction along the X axis and the θz direction, thesecond position adjusting actuator moves the third plate in a directionalong the Y axis, and the first elastic member is elastically deformablein the direction along the X axis.